ERX Edge Routers Installation and User Guide

CHAPTER 8
Troubleshooting
8-10
Monitoring Temperatures of Modules
You can view the temperature of each module by issuing the show
environment all and show environment table commands. In
addition, the system generates detailed log messages if the temperature of
a module is outside normal operating limits.
If the temperature of any module exceeds the upper temperature limit,
the system immediately goes into thermal protection mode. Once the
system has entered thermal protection mode, you must resolve the cause
of the high temperature.
When you have resolved the cause of the high temperature, you must
power cycle the system to reset the modules.
Table 8-5 Redundancy status of a line module
ONLINE LED REDUNDANT LED State of the Line Module
Off Off Module is booting or is an inactive primary line
module.
On Off Module is active, but no standby module is
available.
Off On Module is in standby state.
On On Module is active, and a standby module is
available.
Table 8-6 Troubleshooting high-temperature conditions
Cause of High Operating
Temperature
Symptoms Resolution
Air vents to system are blocked Space around system does not meet
specifications (see Appendix A,
System Specifications).
Increase space around system.
Ambient temperature exceeds
specifications
Ambient temperature exceeds
specifications (see Appendix A,
System Specifications).
Provide extra cooling or heating in
the room where the system is
located.
Cooling fan failure • FAN OK LED on SRP module is
not illuminated.
• FAN FAIL LED on SRP module is
illuminated.
Replace fan tray (see Chapter 7,
Maintaining the ERX System).
Module failure FAIL LED on module is illuminated. Replace module (see Chapter 3,
Installing ERX Modules).